Abstract
The asymmetric unit of the title salt, C7H18N3+·C7HN4−, comprises one cation and one anion. TheN,N,N′,N′,N′′,N′′-hexamethylguanidinium ion shows orientational disorder and two sets of N- and C-atom positions were found, with an occupancy ratio of 0.535 (3):0.465 (3). The C—N bond lengths in the guanidinium ion range from 1.339 (16) to 1.35 (2) Å, indicating partial double-bond character pointing towards charge delocalization within the NCN planes. The negative charge in the 1,1,3,3-tetracyanoprop-2-en-1-ide ion is delocalized within the CCC planes with the C—C bonds ranging in length from 1.379 (3) to 1.427 (3) Å, also indicating partial double-bond character.
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